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blog.yappare.com | ||
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www.dbaglobe.com
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| | | | | A blog about on new technologie. Hands-on note about Hadoop, Cloudera, Hortonworks, NoSQL, Cassandra, Neo4j, MongoDB, Oracle, SQL Server, Linux, etc. | |
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mwidlake.wordpress.com
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| | | | | 1 post published by mwidlake on July 3, 2009 | |
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alexzeng.wordpress.com
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| | | | | I am reading Expert Oracle Practices by Oracle Database Administration from the Oak Table. I'd like to summary and share what I learned. This chapter PL/SQL and the CBO by Jo?e Senega?nik is pretty interesting. It tells how to use oracle extensible optimizer to set the selectivity and the cost of PL/SQL functions. This will... | |
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jonathanlewis.wordpress.com
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| | | Jump to summary. A new optimizer feature that appears in 23c (probably not 21c) was the ability to push group by clauses into union all set operations. This will happen unhinted, but can be hinted with the highly memorable [no_]push_gby_into_union_all() hint that appeared in 23.1.0.0 according to v$sql_hint. and the feature can be disabled by... | ||
